Update: according to a bulletin update from the CME, the ECBOT, Globex and Nymex are once again available for trading.

However some traders continue to report intermittent problems with order execution and clearing, and are getting notices such as this one:

“We are aware of a technical issue in which multiple Market Segment Gateways failed over. Support is investigating.”

More as we see it.

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We may have found the reason for the sharp selloff in commodities, and the leg lower in the ES this afternoon: it appears that the CME is experiencing major issues, in some reported cases not accepting buy orders.